A classic. I bought a vinyl copy of The Wall on the day it was released, November 30, 1979. Oddly, I really didn't care much for it for a couple years. There were a couple of songs I liked (this and "Goodbye, Blue Sky" stand out in my mind), but overall, I was disappointed. It took many listens, but eventually, it won me over (Most of those listens were played by friends- it wasn't an album I'd have chosen to slap on the platter.) Today, though, I came across a fun variation of this song, so I wanted to post the original version to refresh memories and provide a clear contrast.
Now here's the same song done as a Gregorian Chant:
A little while ago, I was recommended as a person who might be helpful in identifying unknown rock or mineral samples from photographs via Twitter. I'm flattered, to be sure. However, my response was measured: "Thanks for consideration, I'll certainly do what I can. However, ID'ing rocks with photo only is *very* tentative."
This is a topic that comes up often- probably daily, at least- in the online geology community: identifying rocks from a photo only is very tricky, and to describe the final consensus as "tentative" may even be an overstatement. It's perhaps best described as a hypothesis: an educated guess. As I've said before, after handling tens of thousands of samples, known and unknown, and hundreds of different kinds of rocks with hundreds of different kinds of textures and other features, the process of identification becomes internalized to the point that it's almost unconscious. Most important, it is by no means only visual. We use all of our senses in identifying a sample. As an analogy, imagine we saw the entire visual spectrum in a gray-scale, and someone sent you a photograph of a rainbow, asking for an ID. You might very well guess it's a rainbow, but there are quite a number of other phenomena that create a semi-circle of brighter light in the sky- all sorts of arcs and halos from ice crystal diffraction, for example. So a practiced cloud observer might well guess "rainbow" is the most likely identification, but without more information (position of sun relative to unknown, sky/weather conditions, for example), you're just guessing which is most likely, with no real way to be confident.
So I started a hashtag, #WebRockIDTips, which will be quite short-lived, I'm sure, to post some comments on features and characteristics that I and others would find helpful in pinning down a somewhat more confident identification of a geological photograph- whether it's a single rock or a whole outcrop. This post is to archive those comments for future reference. Tweets with no identifier are mine; others' tweets will include an identifier. Here's what we have so far, and I'll add others as they come in.
Just got recommended as a geotweep to help ID rocks over twitter. What, along with photo, also helpful? Scale (ruler great!)
Different photos with different angles, perspectives.
Location, Location, Location- the closer to original source, the better- this can seriously narrow possibilities.
Oddities- what is unusual about this rock? What brought it to your attention? Density? Luster? Grains? Why interesting?
What do other geotweeps wish folks requesting rock photo ID's would include as helpful info?
As a final comment, I'll say that as a general rule, if I'm online, I'll respond within a few minutes to a tweet mention (@lockwood dewitt) that needs a response. I don't have a connection (of my own, or dependable) at home though. So if I'm offline, I can't respond. Who else among geotweeps has been active in rock photo ID's?
If you can think of (an)other geotweep(s) who have/has been involved in rock photo identification- or if you have, or would be willing- please add suggestion(s) in comments below, or send via Twitter to me with a mention. If the latter, please include the hashtag #WebRockIDTips
Interzone is open from 8 until 2 tomorrow, and news, et cetera, tends to be much slower on Holidays, so I may very well be able to put up a real post for the day. But I don't think I've ever posted this scene from "Addams Family Values" before, and on the off chance there might be someone in the US who hasn't seen it, enjoy a re-enactment of the first Thanksgiving. As only Wednesday Addams might conceive it.